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The second IF signal is converted in the Mixer (M) by means of the 28.3 MHz Local Oscillator
(LO) into the third IF signal, and further filtered by 10.7 MHz filter (BPF3), which also determines
the receiver bandwidth.
Logarithmic Gain Amplifier Limiter (LGAL) performs logarithmation and signal detection.
Peak Detector (PD) enables the measurement of the video carrier level by means of Analogue-
to-Digital Converter (ADC). The digital code of the input signal peak level logarithm is defined as
real value and corrected in accordance with the calibration matrix of the Control Unit (CU)
microcontroller.
From the LGAL limiter output signal is forwarding to the frequency detector with the built in
analog-to-digital converter, and as a result, demodulated and digitalized signal is processed with
the control unit. This allows to perform analog channel audio brouadcasting monitoring
In digital DVB-C/DVB-T signal demodulation mode the second IF signal is filtered by the
Bandpass Filter (BPF2) and supplied to the DVB-C/DVB-T Demodulator (DD), which performs
demodulation and measurement of signal parameters. The measured results are processed by the
Control Unit.
The Control Unit (CU) uses the Control Interfaces (CI) to support the Analyzer operation with
ViewRSA software and receive the commands entered by the user during the Analyzer
configuration via COM port.
The nonvolatile memory (NVRAM) stores factory calibration coefficients, channel template,
channel plan, limit plan, measurement logs, and service information.
The Mains Adapter (MA) forms the required voltages from an external power source.
1.7.3. Component Arrangement
CIU-003 TV Signal Analyzer is made in 19''/1U steel shockproof sectional housing that includes
printed and three-dimensional wiring. The Analyzer dimensions are 483x163x44 mm.
The front panel of the Analyzer (see Figure 1.1) has the POWER indicator (index 1) and holes
for mounting the Analyzer on the rack (index 2). The back panel of the Analyzer (see Figure 1.2)
contains a socket for mains supply (index 1), fuse-holder (index 2), mains switch (index 3),
additional grounding connector
connection to LAN (index 5), RS-232 DB-9 connector for setting and updating the Analyzer
firmware from external PC (index 6), label with the device serial number and type (index 7), and
the RF IN input 75 Ohm F-male connector (index 8).
2. PREPARATION FOR OPERATION
Perform external examination to make sure your CIU-003 is free from any visible mechanical
damage.
Upon receipt of the package, check the availability of the items contained in it against the list
provided (see Section 1.5).
If your CIU-003 has been kept in the environment other than the rated operating conditions,
leave the Analyzer in facilities with normal operating conditions at least for 2 hours prior to
operation.
If the Analyzer is going to be used in laboratory (without mounting into the rack), fix 4 rubber
mounts into the holes of the Analyzer housing base.
1
For hardware modification 2.14.2 or higher
(index 4), ETHERNET RJ-45 connector for the Analyzer
10
1
.
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